Survey work on the American Samoan island of Aunu'u, a small island
off the eastern end of Tutuila, combined with review of museum collections,
increased the known land snail fauna of the island from 2 to 22 species. Of these
species, 12 are native to the Samoan Archipelago, nine are introduced, and one
is cryptogenic (of unknown origin). The fauna is a subset of that of the main
American Samoan island of Tutuila, although it also includes one species endemic
to Aunu'u but now extinct.

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University of Hawai'i Press

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The Land Snails of a Small Tropical Pacific Island Aunu'u, American Samoa